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In-Situ High Pressure Raman Spectrum and Electrical Property of PbMoO4
作者姓名:于翠玲  于清江  高春晓  刘鲍  郝爱民  贺春元  黄晓伟  张东梅  崔晓岩  李冬妹  马彦章  邹广田
作者单位:[1]State Key Laboratory for Superhard Materials, Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012 [2]Department of MechanicM Engineering, Texas Tech University, Lubbock, TX 79409
基金项目:Supported by the National Natural Science Foundation of China under Grant Nos 40473034, 40404007, 10574055 and 50532020, and the National Basic Research Programme of China under Grant No 2005CB724404.
摘    要:In-situ high pressure Raman spectra and electrical conductivity measurements of scheelite-structure compound PbMoO4 are presented. The Raman spectrum of PbMoO4 is determined up to 26.5 GPa on a powdered sample in a diamond anvil cell (DAC) under nonhydrostatic conditions. The PbMoO4 gradully experiences the trans- formation from the crystal to amorphous between 9.2 and 12.5 GPa. The crystal to amorphous transition may be due to the mechanical deformation and the crystalographic transformation. Furthermore, the electrical conductivity of PbMoO4 is in situ measured accurately using a microcircuit fabricated on a DAC based on the van der Pauw method. The results show that the electrical conductivity of PbMoO4 increases with increases of pressure and temperature. At 26.5 GPa, the electrical conductivity value of PbMoO4 at 295K is 1.93 - 10-4 S/cm, while it raises by one order of magnitude at 430K and reached 3.33 - 10-3 S/cm. However, at 430K, compared with the electrical conductivity value of PbMoO4 at 26.5 GPa, it drops by about two order magnitude at 7.4 GPa and achieves 2.81 × 10^-5 S/cm. This indicates that the effect of pressure on the electrical conductivity of PbMoO4 is more obvious than that of temperature.

关 键 词:高压  原子  离子  电子束
收稿时间:2007-2-11
修稿时间:2007-02-11

In-Situ High Pressure Raman Spectrum and Electrical Property of PbMoO4
YU Cui-Ling,YU Qing-Jiang,GAO Chun-Xiao,LIU Bao,HAO Ai-Min,HE Chun-Yuan,HUANG Xiao-Wei,ZHANG Dong-Mei,CUI Xiao-Yan,LI Ming,LI Dong-Mei,Ma Yan-Zhang,ZOU Guang-Tian.In-Situ High Pressure Raman Spectrum and Electrical Property of PbMoO4[J].Chinese Physics Letters,2007,24(8):2204-2207.
Authors:YU Cui-Ling  YU Qing-Jiang  GAO Chun-Xiao  LIU Bao  HAO Ai-Min  HE Chun-Yuan  HUANG Xiao-Wei  ZHANG Dong-Mei  CUI Xiao-Yan  LI Ming  LI Dong-Mei  Ma Yan-Zhang  ZOU Guang-Tian
Institution:1 State Key Laboratory for Superhard Materials, Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012 ; 2.Department of MechanicM Engineering, Texas Tech University, Lubbock, TX 79409
Abstract:In-situ high pressure Raman spectra and electrical conductivity measurements of scheelite-structure compound PbMoO4 are presented. The Raman spectrum of PbMoO4 is determined up to 26.5GPa on a powdered sample in a diamond anvil cell (DAC) under nonhydrostatic conditions. The PbMoO4 gradually experiences the transformation from the crystal to amorphous between 9.2 and 12.5GPa. The crystal to amorphous transition may be due to the mechanical deformation and the crystallographic transformation. Furthermore, the electrical conductivity of PbMoO4 is in situ measured accurately using a microcircuit fabricated on a DAC based on the van der Pauw method. The results show that the electrical conductivity of PbMoO4 increases with increases of pressure and temperature. At 26.5GPa, the electrical conductivity value of PbMoO4 at 295K is 1.93×10-4S/cm, while it raises by one order of magnitude at 430K and reached 3.33×10-3S/cm. However, at 430K, compared with the electrical conductivity value of PbMoO4 at 26.5GPa, itdrops by about two order magnitude at 7.4GPa and achieves 2.81×10-5S/cm. This indicates that the effect of pressure on the electrical conductivity of PbMoO4 is more obvious than that of temperature.
Keywords:07  35  +k  64  60  -i  72  20  -i
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